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Dependence of Soil Respiration on Soil Temperature and Soil Moisture in Successional Forests in Southern China

Journal of Integrative Plant Biology 2006年第6期48卷 654-663页

作者： Xu-Li Tang Guo-Yi Zhou Shu-Guang Liu De-Qiang Zhang Shi-Zhong Liu Jiong Li Cun-Yu Zhou South China Botanical Garden the Chinese Academy of Sciences Guangzhou 510650 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Science Applications International Corporation （ SAIC） US Geological Survey （ USGS） National Center for Earth Resources Observation and Science （EROS） Sioux Falls South Dakota 57198 USA

The spatial and temporal variations in soil respiration and its relationship with biophysical factors In forests near the Tropic of Cancer remain highly uncertain. To contribute towards an Improvement of actual estimates, soil respiration rates, soil temperature, and soil moisture were measured In three successional subtropical forests at the Dlnghuahan nature reserve （DNR） In southern China from March 2003 to February 2005. The overall objective of the present study was to analyze the temporal variations of soil respiration and Its biophysical dependence in these forests. The relationships between biophysical factors and soil respiration rates were compared In successional forests to test the hypothesis that these forests responded similarly to biophysical factors. The seasonality of soil respiration coincided with the seasonal climate pattern, with high respiration rates in the hot humid season （April-September） and with low rates In the cool dry season （October-March）. Soil respiration measured at these forests showed a clear Increasing trend with the progressive succession. Annual mean （± SD） soil respiration rate In the DNR forests was （9.0 ± 4.6） Mg CO2-C/hm^2 per year, ranging from （6.1 ± 3.2） Mg CO2-C/hm^2 per year in early successional forests to （10.7 ± 4.9） Mg CO2-C/hm^2 per year in advanced successional forests. Soil respiration was correlated with both soil temperature and moisture. The T/M model, where the two biophysical variables are driving factors, accounted for 74%-82% of soil respiration variation In DNR forests. Temperature sensitivity decreased along progressive succession stages, suggesting that advanced-successional forests have a good ability to adjust to temperature. In contrast, moisture Increased with progressive succession processes. This increase is caused, in part, by abundant respirators In advanced-successional forest, where more soil moisture is needed to maintain their activities.

关键词： dinghushan nature reserve moisture sensitivity Q10 soil CO2 efflux soil respiration subtropical forests successional forests temperature sensitivity Tropic of Cancer.

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Impact of temperature and moisture on soil respiration:deconvolution analysis of field data in subtropical forests in southern China

Impact of temperature and moisture on soil respiration:decon...

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中国生态学会2006学术年会

作者：唐旭利中国科学院华南植物园

＜正＞Evaluation of the relative influence of temperature and moisture on soil respiration is critical for making reliable predictions of soil carbon（C）cycle,and for refining process based soil C mod- *** studies have encountered considerable difficulty in separating temperature and moisture impact on soil respiration on the basis of field data because these two factors are confounded in

关键词： deconvolution analysis soil CO2 efflux impacts of soil temperature and soil moisture dinghushan nature reserve

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